Marquis Software Solutions

Disclosed Nov 26, 2025400,000 affectedConfirmed

Ransomware at bank marketing vendor Marquis exposes 400,000+ customers

Marquis, a marketing and compliance vendor to over 700 banks and credit unions, said an August 14, 2025 ransomware attack via a SonicWall firewall flaw exposed customer data including SSNs; state filings showed at least 400,000 affected.

What is known

People affected	400,000 (as reported by the organization)
Disclosed	Nov 26, 2025
Discovered	Aug 14, 2025
Happened	Aug 14, 2025
Attack	Ransomware
Data exposed	NamesSocial Security numbersFinancialPayment cardsDates of birthAddresses
Sector	Finance · US
Status	Confirmed

Sources

Official noticeoag.ca.gov

California Attorney General breach notice: Marquis Software Solutions

Official noticeatg.wa.gov

Washington Attorney General breach notice: Marquis Software Solutions

Official noticeattorneygeneral.delaware.gov

Notice letter filed with the Delaware DOJ: Marquis Software Solutions

Official noticejustice.oregon.gov

Oregon DOJ breach notice: Marquis Software Solutions

Newstechcrunch.com

Fintech firm Marquis alerts dozens of US banks and credit unions of a data breach after ransomware attack

Newsbleepingcomputer.com

Marquis data breach impacts over 74 US banks, credit unions

Official noticeoag.my.site.com

Texas Attorney General data security breach report BR-0004697: Marquis Software Solutions

Official noticeago.vermont.gov

Vermont Attorney General: 2026-03-16 Marquis Software Solutions Data Breach Notice to Consumers

Official noticeago.vermont.gov

Vermont Attorney General: 2025-11-26 Marquis Software Solutions Data Breach Notice to Consumers

Notices filed

Residents of WANov 26, 2025

Washington AG269,773 people

Residents of DENov 26, 2025

Delaware DOJ937 people

Residents of VTNov 26, 2025

Vermont AGCount not stated

Residents of DENov 26, 2025

Delaware DOJ937 people

TotalDec 1, 2025

Research400,000 people

Residents of CADec 2, 2025

California AGCount not stated

Residents of TXDec 2, 2025

Texas AG354,289 people

Residents of ORDec 15, 2025

Oregon DOJ13,169 people

Residents of CAFeb 11

California AGCount not stated

Residents of CAMar 16

California AGCount not stated

Residents of VTMar 16

Vermont AGCount not stated

Residents of WAMar 17

Washington AG269,773 people

History of this record

source2026-09-25

empty to https://ago.vermont.gov/document/2025-11-26-marquis-software-solutions-data-breach-notice-consumersby backfillSource

source2026-09-25

empty to https://ago.vermont.gov/document/2026-03-16-marquis-software-solutions-data-breach-notice-consumersby backfillSource

data_types2026-09-25

["names","ssn","financial"] to ["names","ssn","financial","payment-card","dob","addresses"]by backfillSource

sector2026-09-25

tech to financeby seedSource

data_types2026-09-25

["names"] to ["names","ssn","financial"]by seedSource

records_basis2026-09-25

empty to organizationby seedSource

records2026-09-25

empty to 400000by seedSource

summary2026-09-25

empty to Marquis, a marketing and compliance vendor to over 700 banks and credit unions, said an August 14, 2025 ransomware attack via a SonicWall firewall flaw exposed customer data including SSNs; state filings showed at least 400,000 affected.by seedSource

title2026-09-25

empty to Ransomware at bank marketing vendor Marquis exposes 400,000+ customersby seedSource

data_types2026-09-25

[] to ["names"]by backfillSource

disclosed2026-09-25

2025-12-02 to 2025-11-26by backfillSource

attack2026-09-25

unknown to ransomwareby backfillSource

discovered2026-09-25

empty to 2025-08-14by backfillSource

disclosed2026-09-25

2026-02-11 to 2025-12-02by backfillSource

disclosed2026-09-25

2026-03-16 to 2026-02-11by backfillSource

occurred2026-09-25

empty to 2025-08-14by backfillSource

Added2026-09-25

First recordedby backfillSource

First seen 2026-09-25 (California AG), confirmed by California AG. Record counts are as reported. Not legal advice.

Everything about Marquis Software Solutions